ContentType.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / ContentType.cs / 1305376 / ContentType.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net.Mime 
{ 
    using System;
    using System.Collections; 
    using System.Collections.Specialized;
    using System.IO;
    using System.Text;
    using System.Globalization; 
    using System.Net.Mail;
 
    ///  
    /// Typed Content-Type header
    /// 
    /// We parse the type during construction and set.
    /// null and string.empty will throw for construction,set and mediatype/subtype
    /// constructors set isPersisted to false.  isPersisted needs to be tracked seperately
    /// than isChanged because isChanged only determines if the cached value should be used. 
    /// isPersisted tracks if the object has been persisted. However, obviously if isChanged is true
    /// the object isn't  persisted. 
    /// If any subcomponents are changed, isChanged is set to true and isPersisted is false 
    /// ToString caches the value until a isChanged is true, then it recomputes the full value.
    ///  



    public class ContentType 
    {
        string mediaType; 
        string subType; 
        bool isChanged;
        string type; 
        bool isPersisted;
        TrackingStringDictionary parameters;

        ///  
        /// Default content type - can be used if the Content-Type header
        /// is not defined in the message headers. 
        ///  
        internal readonly static string Default = "application/octet-stream";
 
        public ContentType() : this(Default)
        {
        }
 
        /// 
        /// ctor. 
        ///  
        /// Unparsed value of the Content-Type header.
        public ContentType(string contentType) 
        {
            if (contentType == null) {
                throw new ArgumentNullException("contentType");
            } 
            if (contentType == String.Empty) {
                throw new ArgumentException(SR.GetString(SR.net_emptystringcall,"contentType"), "contentType"); 
            } 
            isChanged = true;
            type = contentType; 
            ParseValue();
        }

        public string Boundary 
        {
            get 
            { 
                return Parameters["boundary"];
            } 
            set
            {
                if (value == null || value == string.Empty) {
                    Parameters.Remove("boundary"); 
                }
                else{ 
                    Parameters["boundary"] = value; 
                }
            } 
        }

        public string CharSet
        { 
            get
            { 
                return Parameters["charset"]; 
            }
            set 
            {
                if (value == null || value == string.Empty) {
                    Parameters.Remove("charset");
                } 
                else{
                    Parameters["charset"] = value; 
                } 
            }
        } 

        /// 
        /// Gets the media type.
        ///  
        public string MediaType
        { 
            get 
            {
                return mediaType + "/" + subType; 
            }
            set
            {
                if (value == null) { 
                    throw new ArgumentNullException("value");
                } 
 
                if (value == string.Empty) {
                    throw new ArgumentException(SR.GetString(SR.net_emptystringset), "value"); 
                }

                int offset = 0;
                mediaType = MailBnfHelper.ReadToken(value, ref offset, null); 
                if (mediaType.Length == 0 || offset >= value.Length || value[offset++] != '/')
                    throw new FormatException(SR.GetString(SR.MediaTypeInvalid)); 
 
                subType = MailBnfHelper.ReadToken(value, ref offset, null);
                if(subType.Length == 0 || offset < value.Length){ 
                    throw new FormatException(SR.GetString(SR.MediaTypeInvalid));
                }

                isChanged = true; 
                isPersisted = false;
            } 
        } 

 
        public string Name {
            get {
                string value = Parameters["name"];
                Encoding nameEncoding = MimeBasePart.DecodeEncoding(value); 
                if(nameEncoding != null)
                    value = MimeBasePart.DecodeHeaderValue(value); 
                return value; 
            }
            set { 
                if (value == null || value == string.Empty) {
                    Parameters.Remove("name");
                }
                else{ 
                    if (MimeBasePart.IsAscii(value, false)) {
                        Parameters["name"] = value; 
                    } else { 
                        Encoding encoding = Encoding.GetEncoding(MimeBasePart.defaultCharSet);
                        Parameters["name"] = MimeBasePart.EncodeHeaderValue(value, encoding, MimeBasePart.ShouldUseBase64Encoding(encoding)); 
                    }
                }
            }
        } 

 
        public StringDictionary Parameters 
        {
            get 
            {
                if (parameters == null)
                {
                    if (type == null) { 
                        parameters = new TrackingStringDictionary();
                    } 
                } 
                return parameters;
            } 
        }


 
        internal void Set(string contentType, HeaderCollection headers) {
            type = contentType; 
            ParseValue(); 
            headers.InternalSet(MailHeaderInfo.GetString(MailHeaderID.ContentType), ToString());
            isPersisted = true; 
        }


        internal void PersistIfNeeded(HeaderCollection headers, bool forcePersist) { 
            if (IsChanged || !isPersisted || forcePersist) {
                headers.InternalSet(MailHeaderInfo.GetString(MailHeaderID.ContentType), ToString()); 
                isPersisted = true; 
            }
        } 

        internal bool IsChanged {
            get {
                return (isChanged || parameters != null && parameters.IsChanged); 
            }
        } 
 
        public override string ToString() {
            if (type == null || IsChanged) 
            {
                StringBuilder builder = new StringBuilder();
                builder.Append(mediaType);
                builder.Append('/'); 
                builder.Append(subType);
                foreach (string key in Parameters.Keys) 
                { 
                    builder.Append("; ");
                    builder.Append(key); 
                    builder.Append('=');
                    MailBnfHelper.GetTokenOrQuotedString(parameters[key], builder);
                }
                type = builder.ToString(); 
                isChanged = false;
                parameters.IsChanged = false; 
                isPersisted = false; 
            }
            return type; 
        }

        public override bool Equals(object rparam) {
            if (rparam == null) { 
                return false;
            } 
 
            return (String.Compare(ToString(), rparam.ToString(), StringComparison.OrdinalIgnoreCase ) == 0);
        } 

        public override int GetHashCode(){
            return ToString().GetHashCode();
        } 

        // Helper methods. 
 
        void ParseValue()
        { 
            int offset = 0;
            Exception exception = null;
            parameters = new TrackingStringDictionary();
 
            try{
                mediaType = MailBnfHelper.ReadToken(type, ref offset, null); 
                if (mediaType == null || mediaType.Length == 0 ||  offset >= type.Length || type[offset++] != '/'){ 
                    exception = new FormatException(SR.GetString(SR.ContentTypeInvalid));
                } 

                if (exception == null) {
                    subType = MailBnfHelper.ReadToken(type, ref offset, null);
                    if (subType == null || subType.Length == 0){ 
                        exception = new FormatException(SR.GetString(SR.ContentTypeInvalid));
                    } 
                } 

                if (exception == null) { 
                    while (MailBnfHelper.SkipCFWS(type, ref offset))
                    {
                        if (type[offset++] != ';'){
                            exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); 
                            break;
                        } 
 
                        if (!MailBnfHelper.SkipCFWS(type, ref offset))
                            break; 

                        string paramAttribute = MailBnfHelper.ReadParameterAttribute(type, ref offset, null);

                        if(paramAttribute == null || paramAttribute.Length == 0){ 
                            exception = new FormatException(SR.GetString(SR.ContentTypeInvalid));
                            break; 
                        } 

                        string paramValue; 
                        if ( offset >= type.Length || type[offset++] != '='){
                            exception = new FormatException(SR.GetString(SR.ContentTypeInvalid));
                            break;
                        } 

                        if (!MailBnfHelper.SkipCFWS(type, ref offset)){ 
                            exception = new FormatException(SR.GetString(SR.ContentTypeInvalid)); 
                            break;
                        } 

                        if (type[offset] == '"')
                            paramValue = MailBnfHelper.ReadQuotedString(type, ref offset, null);
                        else 
                            paramValue = MailBnfHelper.ReadToken(type, ref offset, null);
 
                        if(paramValue == null){ 
                            exception = new FormatException(SR.GetString(SR.ContentTypeInvalid));
                            break; 
                        }

                        parameters.Add(paramAttribute, paramValue);
                    } 
                }
                parameters.IsChanged = false; 
            } 
            catch(FormatException){
                throw new FormatException(SR.GetString(SR.ContentTypeInvalid)); 
            }

            if(exception != null){
                throw new FormatException(SR.GetString(SR.ContentTypeInvalid)); 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ContentType.cs source code in C# .NET

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